VLT
®
4000 VT
Reset
resets the VLT AFD after an alarm; however, not
all alarms can be reset (trip locked) cycling line power
supply. See table in
List of warnings and alarms
. Reset
will be activate on the rising edge of the signal.
Coasting stop, inverse
is used to force the VLT
Freeze AFD to "release" the motor immediately (the
output transistors are "turned off") to make it coast
freely to stop. Logic "0" implements coasting to stop.
Reset and coasting stop, inverse
is used
foractivating coasting stop at the same time as reset.
Logic "0" implements coasting stop and reset. Reset
will be activate on the falling edge of the signal.
DC braking, inverse
is used for stopping the motor
by energizing it with a DC voltage for a given time, see
parameters 114-116
DC brake
. Please note that this
function is only active if the value of parameters 114
DC
brake current
and 115
DC braking
time is different from
0. Logic ‘0
’
implements DC braking. See
DC braking
.
Safety interlock
has the same function as Coasting
stop, inverse, but
Safety interlock
generates the alarm
message
’
external fault
’
on the display when terminal
27 is logic ‘0
’
. The alarm message will also be active
via digital outputs 42/45 and relay outputs 1/2, if
programmed for
Safety interlock
. The alarm can be
reset using a digital input or the [OFF/STOP] key.
Start
is selected if a start/stop command is required.
Logic "1" = start, logic "0" = stop.
Reversing
is used for changing the direction of
rotation of the motor shaft. Logic "0" will not
implement reversing. Logic "1" will implement
reversing. The reversing signal only changes the
direction of ro-tation; it does not activate the start
function. It can not be used in
Closed loop
.
Reversing and start
is used for start/stop and
reversing using the same signal.
A start signal via terminal 18 at the same
time is not allowed.
Is not active together with
Closed loop
.
Freeze reference
freezes the present reference. The
frozen reference can now only be changed by means
of
Speed up
or
Speed down
. The frozen reference is
saved after a stop command and in case of line failure.
Freeze output
freezes the present output frequency
(in Hz). The frozen output frequency can now only
be changed by
Speed up
or
Speed down
.
NOTE
If Freeze output is active, the VLT AFD cannot
be stopped via terminal 18. The VLT AFD can
only be stopped when terminal 27 or terminal
19 has been programmed for
DC braking, inverse
.
Selection of Setup, lsb
or
Selection of Setup,
msb
enables a choice of one of the four Setups.
However, this assumes that parameter 002
Active
Setup
has been set at
Multi Setup
[5].
Setup, msb
Setup, lsb
Setup 1
0
0
Setup 2
0
1
Setup 3
1
0
Setup 4
1
1
Preset reference, on
is used for switching
between remote reference and preset reference.
This assumes that
Remote/preset
[2] has been
selected in parameter 210
Reference type
. Logic
"0" = remote references active; logic "1" = one of
the four preset references is active in accordance
with the table on the next page.
Preset reference, lsb
and
Preset reference, msb
enables a choice of one of the four preset references,
in accordance with the table below.
Preset ref., msb
Preset ref., lsb
Preset ref. 1
0
0
Preset ref. 2
0
1
Preset ref. 3
1
0
Preset ref. 4
1
1
Speed up and
and
Speed down
are selected
if digital control of the up/down speed is desired.
This function is only active if
Freeze reference
or
Freeze output
has been selected.
As long as there is a logic "1" on the terminal selected
for
Speed up
, the reference or the output frequency will
increase by the
Ramp-up time
set in parameter 206.
As long as there is a logic "1" on the terminal selected for
Speed down
, the reference or the output frequency will
increase by the
Ramp-down time
set in parameter 207.
MG.40.A7.22 - VLT is a registered Danfoss trademark
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